667404349 has 2 divisors, whose sum is σ = 667404350. Its totient is φ = 667404348.

The previous prime is 667404341. The next prime is 667404359. The reversal of 667404349 is 943404766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 480398724 + 187005625 = 21918^2 + 13675^2 .

It is a cyclic number.

It is not a de Polignac number, because 667404349 - 2³ = 667404341 is a prime.

It is a super-2 number, since 2×667404349² = 890857130128227602, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667404341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333702174 + 333702175.

It is an arithmetic number, because the mean of its divisors is an integer number (333702175).

Almost surely, 2^667404349 is an apocalyptic number.

It is an amenable number.

667404349 is a deficient number, since it is larger than the sum of its proper divisors (1).

667404349 is an equidigital number, since it uses as much as digits as its factorization.

667404349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 43.

The square root of 667404349 is about 25834.1701821444. The cubic root of 667404349 is about 873.9025584019.

The spelling of 667404349 in words is "six hundred sixty-seven million, four hundred four thousand, three hundred forty-nine".